Nephrology · Internal Medicine

Urine Anion Gap calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Urine sodium

mmol/L

Allowed range: 0–200 mmol/L

Urine potassium

mmol/L

Allowed range: 0–200 mmol/L

Urine chloride

mmol/L

Allowed range: 0–200 mmol/L

Result

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Clinical inputs

Urine sodium (mmol/L)Accepted range: 0 to 200
Urine potassium (mmol/L)Accepted range: 0 to 200
Urine chloride (mmol/L)Accepted range: 0 to 200

Primary source

Emmett M, Narins RG. Clinical use of the urine anion gap. Medicine (Baltimore). DOI: 10.1097/00005792-197705000-00001. PMID: 860918. Scope: urine anion gap (mEq/L) = urine sodium + urine potassium − urine chloride, used as an indirect estimate of urine ammonium in hyperchloremic metabolic acidosis. (1977)

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